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Merge pull request #42013 from Xrayez/fix-list-swap 

Fix `List` swap behavior on front, back and adjacent elements
This commit is contained in:
Rémi Verschelde 2020-09-16 17:39:43 +02:00 committed by GitHub
parent 1777211271 4e6b5169b0
commit 6ac7b90097
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 305 additions and 15 deletions
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40
core/list.h
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@ -395,28 +395,38 @@ public:
ERR_FAIL_COND(p_A->data != _data);
ERR_FAIL_COND(p_B->data != _data);
if (p_A == p_B) {
return;
}
Element *A_prev = p_A->prev_ptr;
Element *A_next = p_A->next_ptr;
Element *B_prev = p_B->prev_ptr;
Element *B_next = p_B->next_ptr;
p_A->next_ptr = p_B->next_ptr;
p_A->prev_ptr = p_B->prev_ptr;
p_B->next_ptr = A_next;
p_B->prev_ptr = A_prev;
if (p_A->prev_ptr) {
p_A->prev_ptr->next_ptr = p_A;
if (A_prev) {
A_prev->next_ptr = p_B;
} else {
_data->first = p_B;
}
if (p_A->next_ptr) {
p_A->next_ptr->prev_ptr = p_A;
if (B_prev) {
B_prev->next_ptr = p_A;
} else {
_data->first = p_A;
}
if (p_B->prev_ptr) {
p_B->prev_ptr->next_ptr = p_B;
if (A_next) {
A_next->prev_ptr = p_B;
} else {
_data->last = p_B;
}
if (p_B->next_ptr) {
p_B->next_ptr->prev_ptr = p_B;
if (B_next) {
B_next->prev_ptr = p_A;
} else {
_data->last = p_A;
}
p_A->prev_ptr = A_next == p_B ? p_B : B_prev;
p_A->next_ptr = B_next == p_A ? p_B : B_next;
p_B->prev_ptr = B_next == p_A ? p_A : A_prev;
p_B->next_ptr = A_next == p_B ? p_A : A_next;
}
/**
* copy the list

279
tests/test_list.h Normal file
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@ -0,0 +1,279 @@
/*************************************************************************/
/* test_list.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef TEST_LIST_H
#define TEST_LIST_H
#include "core/list.h"
#include "tests/test_macros.h"
namespace TestList {
static void populate_integers(List<int> &p_list, List<int>::Element *r_elements[], int num_elements) {
p_list.clear();
for (int i = 0; i < num_elements; ++i) {
List<int>::Element *n = p_list.push_back(i);
r_elements[i] = n;
}
}
TEST_CASE("[List] Swap adjacent front and back") {
List<int> list;
List<int>::Element *n[2];
populate_integers(list, n, 2);
list.swap(list.front(), list.back());
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() != list.front()->next());
CHECK(list.front() == n[1]);
CHECK(list.back() == n[0]);
CHECK(list.back()->next() == nullptr);
CHECK(list.back() != list.back()->prev());
}
TEST_CASE("[List] Swap first adjacent pair") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[0], n[1]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() != list.front()->next());
CHECK(list.front() == n[1]);
CHECK(list.front()->next() == n[0]);
CHECK(list.back()->prev() == n[2]);
CHECK(list.back() == n[3]);
CHECK(list.back()->next() == nullptr);
CHECK(list.back() != list.back()->prev());
}
TEST_CASE("[List] Swap middle adjacent pair") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[1], n[2]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() == n[0]);
CHECK(list.front()->next() == n[2]);
CHECK(list.back()->prev() == n[1]);
CHECK(list.back() == n[3]);
CHECK(list.back()->next() == nullptr);
}
TEST_CASE("[List] Swap last adjacent pair") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[2], n[3]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() == n[0]);
CHECK(list.front()->next() == n[1]);
CHECK(list.back()->prev() == n[3]);
CHECK(list.back() == n[2]);
CHECK(list.back()->next() == nullptr);
}
TEST_CASE("[List] Swap first cross pair") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[0], n[2]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() == n[2]);
CHECK(list.front()->next() == n[1]);
CHECK(list.back()->prev() == n[0]);
CHECK(list.back() == n[3]);
CHECK(list.back()->next() == nullptr);
}
TEST_CASE("[List] Swap last cross pair") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[1], n[3]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() == n[0]);
CHECK(list.front()->next() == n[3]);
CHECK(list.back()->prev() == n[2]);
CHECK(list.back() == n[1]);
CHECK(list.back()->next() == nullptr);
}
TEST_CASE("[List] Swap edges") {
List<int> list;
List<int>::Element *n[4];
populate_integers(list, n, 4);
list.swap(n[1], n[3]);
CHECK(list.front()->prev() == nullptr);
CHECK(list.front() == n[0]);
CHECK(list.front()->next() == n[3]);
CHECK(list.back()->prev() == n[2]);
CHECK(list.back() == n[1]);
CHECK(list.back()->next() == nullptr);
}
TEST_CASE("[List] Swap middle (values check)") {
List<String> list;
List<String>::Element *n_str1 = list.push_back("Still");
List<String>::Element *n_str2 = list.push_back("waiting");
List<String>::Element *n_str3 = list.push_back("for");
List<String>::Element *n_str4 = list.push_back("Godot.");
CHECK(n_str1->get() == "Still");
CHECK(n_str4->get() == "Godot.");
CHECK(list.front()->get() == "Still");
CHECK(list.front()->next()->get() == "waiting");
CHECK(list.back()->prev()->get() == "for");
CHECK(list.back()->get() == "Godot.");
list.swap(n_str2, n_str3);
CHECK(list.front()->next()->get() == "for");
CHECK(list.back()->prev()->get() == "waiting");
}
TEST_CASE("[List] Swap front and back (values check)") {
List<Variant> list;
Variant str = "Godot";
List<Variant>::Element *n_str = list.push_back(str);
Variant color = Color(0, 0, 1);
List<Variant>::Element *n_color = list.push_back(color);
CHECK(list.front()->get() == "Godot");
CHECK(list.back()->get() == Color(0, 0, 1));
list.swap(n_str, n_color);
CHECK(list.front()->get() == Color(0, 0, 1));
CHECK(list.back()->get() == "Godot");
}
TEST_CASE("[List] Swap adjacent back and front (reverse order of elements)") {
List<int> list;
List<int>::Element *n[2];
populate_integers(list, n, 2);
list.swap(n[1], n[0]);
List<int>::Element *it = list.front();
while (it) {
List<int>::Element *prev_it = it;
it = it->next();
if (it == prev_it) {
FAIL_CHECK("Infinite loop detected.");
break;
}
}
}
static void swap_random(List<int> &p_list, List<int>::Element *r_elements[], size_t p_size, size_t p_iterations) {
Math::seed(0);
for (size_t test_i = 0; test_i < p_iterations; ++test_i) {
// A and B elements have corresponding indices as values.
const int a_idx = static_cast<int>(Math::rand() % p_size);
const int b_idx = static_cast<int>(Math::rand() % p_size);
List<int>::Element *a = p_list.find(a_idx); // via find.
List<int>::Element *b = r_elements[b_idx]; // via pointer.
int va = a->get();
int vb = b->get();
p_list.swap(a, b);
CHECK(va == a->get());
CHECK(vb == b->get());
size_t element_count = 0;
// Fully traversable after swap?
List<int>::Element *it = p_list.front();
while (it) {
element_count += 1;
List<int>::Element *prev_it = it;
it = it->next();
if (it == prev_it) {
FAIL_CHECK("Infinite loop detected.");
break;
}
}
// We should not lose anything in the process.
if (element_count != p_size) {
FAIL_CHECK("Element count mismatch.");
break;
}
}
}
TEST_CASE("[Stress][List] Swap random 100 elements, 500 iterations.") {
List<int> list;
List<int>::Element *n[100];
populate_integers(list, n, 100);
swap_random(list, n, 100, 500);
}
TEST_CASE("[Stress][List] Swap random 10 elements, 1000 iterations.") {
List<int> list;
List<int>::Element *n[10];
populate_integers(list, n, 10);
swap_random(list, n, 10, 1000);
}
} // namespace TestList
#endif // TEST_LIST_H

1
tests/test_main.cpp
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@ -39,6 +39,7 @@
#include "test_expression.h"
#include "test_gradient.h"
#include "test_gui.h"
#include "test_list.h"
#include "test_math.h"
#include "test_oa_hash_map.h"
#include "test_ordered_hash_map.h"